Reversing device for engines with internal combustion.



H. WIEDERKEHR. v BEVERSING DEVICE FORENGINES WITH INTERNAL GOMBUSTION.

APPLIOATIQN FILED APR.28, 1913. 1 085,653.

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IIIII HIM Patented Feb. 3, 1914.

E. WIEDEEKEHE. EEvEEsING DEVICE PoE ENGINES WITH 'INTERNAL coMEUsTIoN.

' APPLIOATIOII FILED APlIma, 1913.

1,085,653, V Patented Eeb.3, 1914.

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Witnesses:

- UNTTED STATES PATENT OFFTQE;

HANS WIEDERKEHR, 0F WINTERTHUR, SWITZERLAND, ASSIGNOR T0 THE FIRM OF scnwnrznnrscnn LoKoMofrIv anatema. v

& MASCHINENFABRIK, OF WINTERTHUR, SWIT- REVERSING DEVICE FOR ENGINES WITH INTERNAL COMBUSTION.

Leeaess.

Specification of Letters Patent.

Patented nen/3,1914.

Appncaiionaiednprnas,1913. seriaiNo. 764,076.

to' which it appertains to make and use thel same, reference being'had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification. Y

The present invention relates to 'reversing devices for two cycle internal combustion engines. In such engines the reversing of the direction requires one after another the following operations: starting the engine by means of compressed air; changing from the starting to the working position; povver regulation by changing the quantity of fuel. tis alreadv known tti-produce all these operations by means of a hand controlled rotary member but. the present invention dif fers from the usual devices on account of the peculiar conformation of the rotary member. This member has the form of a disk or drum provided with curved tracks into which work pins, which are connected with the relative movable elements of the engine.

The accompanying drawings represent an example of the object of .the invention.

Figure l is .a side view of the reversing device with parts in vertical section. `Fig. 2 .is an elevation of the controlling disk with the curved tracks. Fig. 3 is a vertical section through the distributing shaft and the shaft of the valve levers, with a part of the engine cylinder in vertical section. F ig. 4 is a vertical section through the starting valve. Fig. a vertical section through the fuel valve or the valve for the charge. Fig. (S is ay portion of the controlling disk on an enlarged scale. Fig. 7 a vertical section of Fig. (S. Fig. 8 represents the arrangement of the fuel pump in vertical section and Fig.

9 is a detail of this pump.

The same letters refer to like parts in the ""several figures.

and IQ, into which Work rolls at the ends of lev-ers M, N, T, which serve to move the reversing means. By means of a fixed disk E, provided with notches in its periphery, and a pawl L at the vhandle H, the controlling disk can be fixed in its position. Through the curved groove K1 and the bell-crank lever M the distributing shaft lV may be axially displaced.v This distributing shaft W carries pairs of cams Av, Ar and Bv, B, for. controlling the start-ing valves and the fuel valves; the cams Av and Bv are designed for the going forward and the cams A, and Br for the reversing of the engine.

The starting valve c (Fig. 4) has the usual arrangement; for the supply of comy pressedair, this valve is connected through a pipe (l with a reservoir in the well known manner. The valve g for the charge (Fig- 5) is also of a usual arrangenient; this valve is connected with the fuel pump through the pipe e, while f designates a pipe for the supply of the compressed air of the charge.

By means of the curved groove K2 and the lever N, the shaftI U of the cam levers a.,

I) may be turned, so that the cam levers a and b for the starting and fuel valves, ecceny trically mounted on the shaft U, take either a position in which the lever rolls Oa and Ob will not be touched by the cams and the valves consequently not be moved (position given with full lines in Fig. 3), or in a position in which the' valve will be moved according to the starting and working position.

By means of the. curved groove Km of the lever T and the shaft P, the fuel pump will be put into the working position and also the quantity of fuel regulated. The driving means of this fuel pump have a shaft p,

which is actuated for instance through the main shaft of the engine and is connected with the distributing shaft W through actuating gears y. On the shaft p are mounted eccentrics r and s, which are connected by links t and u respectively with the piston i of the pump and with a reciprocated rod m.

hA is the casing of the fuel pump, Z the delivery vent and o the suction valve; o is the suction chamber and y a pipe to supply fuel to this chamber. The suction valve is controlled through a bell-crank lever v. articulated on a bolt z, which is eccentrically mounted at the end of the shaft `This shaft end with the boltA a reaches into the suction chamber c. On the one arm of the bell-crank lever n. rests the suction valve,-

while the other arm lies against the cnd ofI the reciprocated rod n. Position I (Fig. 2) of the handle corresponds to the stop position of the engine. To start the engine in the forward direction, the controlling disk S will be turned in the direction of the arrow V, whereby the distributing shaft Wr will first be axially displaced and the cams A., for the starting valve and Bv for the fuel-valvev arrive under the cor* responding levers a and Z) (position IIV). `By further turning the controlling disk in the saine direction, the cam lever shaft U will also be turned and the levers a and b moved so that the starting valve can now be moved into the open position and compressed iii` can enter t-he cylinder for starting the engine (position IIIV) by further turning the controlling disk S, the distributing shaft will be further axially moved, whereby the starting cams come out of reach of the levers a,

the starting valves consequentlynow remain closed; the fuel cams Bv remain under the corresponding levers b. Finally the fuel pump will be put into the working position through the shaft P for more or less power corresponding to the position of t-he controlling disk. IV., is the position for the greatest power. The controlling disk being in such a position, that the eccentric bolt e on the end of the shaft P has its highest pesition, then t-he suction valve o will be maintained open through the reciprocated rod" m, and the bell-crank lever n during the whole delivery stroke of the piston z' and no fuel vwill be furnished to the engine. l/Vhen by means of the controlling disk the shaft P is turned and thereby the bolt displaced down ward, an interspace is formed between the valve 0 and the bell-crank lever n; this interspaceis increased as the bell-crank levers are lowered; in the lowest position the valve remains unactuated during the whole delivery stroke; in the intermediate positions, the suction valve wi-ll be maintained open during a greater or smaller portion of the delivery stroke. The eccentricss and fr are at 180 to each other. The same operations take place when the controlling disk is turned in the direction of the arrow R, z'. c. when the engine is to be put froml the stop position on going backward.

When the engine is to be broughtfrom the working position, viz. from going forward or backward into the stop position, the cited operations would take place in inveised succession by turning the controlling disk backward, as far as the axial return of the shaft W is made possible, for instance through an inclined ramp at the starting valves A.,`A,.

' Of course compressed air would again be admitted when the lever N passes over the starting position IIIv or III.. Now in order `to prevent this and also to prevent a loss of the roll at the end of the lever N is prevented from entering the outer branch of the groove K2, and will be rather forced into the inner branch. The latter is so conformed, that the cam lever shaft will be turned back sooner and the rolls-Ql and Ob of the levers a and Z2 come out of reach of the cams, whereby the valve will not be opened. The arrangement of the guide tongues has further the advantage, that tlie distributing shaft Wundergoes only a small laxial displacement, since the cams are notprevented from going back and the inclined. ramp at the cams are unnecessary. The present reversing device is suitable for engines with one or more cylinders. The ldrawings show for instance a double arrangement of the cams on the shaft IV for two cylinders.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to beperformed, I declare that what I claim is:

l. In a reversing device for two cycle, in-

ternal combustion engines, a hand operated rotary controlling member provided with curved tracks for starting, changing over from the starting to the working position and power regulation, in combination with distributing elements 'and actuating means operated by the tracks on turning the con-v trollinginember, substantially as described.

` changing ove.-l froin the starting to the working position and for power regulation, an axially movable distributing shaft, a lever engaging the starting track connected with the shaft, said shaft being provided with cams for actuating the starting valve and fuel pump of the engine. y

4. In a reversing device for two cycle internal combustion engines, in combination,

a hand operated rotary controlling member' provided with curved tracks for startinlg,Y

changing over from the starting to the wor iso valve levers mounted on eccentrics on Said Shaft, substantially as described.

, 5. In a reversing device 'for two cycle internal combustion engines, in combination, a lianol operated rotary controlling member provided with' curved tracks for starting, changing over from the starting to the working position and for power regulation, a lever engaged with the track for power regulation, .a rotary shaft connected with said lever, and means for controlling the suction valve of the fuel pump'through this shaft, substantially as described.

o ln a. reversing device for tivo cycle intermal combustion engines, in combination,

a hand operated rotary controlling member provided with curved tracks for Starting, changing over from the starting to the lWorking position and for power regulation,

the track for changing over ,providedv with outer and inner branches, automatic springcontrolled guide tongues at the end of the inner branches, and means operating the distributing elements by the movement of the controlling member, substantially as described.

ln testimony thatl claim the vforegoing as my invention, I have signed my name in presence of two subscribing Witnesses.

HANS WIEDERKEHR. Witnesses CARL GUBLER, ARNOLD LEHNER. 

